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Guam Long-term Coral Reef Monitoring Program Coral Colony Size and Condition Surveys since 2010

Published by University of Guam Marine Lab | National Oceanic and Atmospheric Administration, Department of Commerce | Metadata Last Checked: January 27, 2026 | Last Modified: 2014-10-09T00:00:00.000+00:00
The Government of Guam's Long-term Coral Reef Monitoring Program, coordinated by the Guam Coastal Management Program until October 2013 and now coordinated by the University of Guam Marine Lab, involves the collection of data for a suite of coral reef ecosystem health parameters at several high priority reef sites around the island of Guam, including Tumon Bay, East Agana Bay, Piti Bay, and Western Shoals. Sites at Fouha Bay, the Achang Reef Flat Marine Preserve, and the Eastern seaward slope near Cocos Island will be established in 2014. Data are collected annually or biennially by a team of highly-trained field biologists from the Guam Coastal Management Program, the NOAA Pacific Islands Regional Office, the University of Guam Marine Lab, and with occasional assistance by staff from other agencies. Corals are the main contributor to coral reef accretion, provide critical habitat for numerous reef organisms, and serve as a food source for some reef organisms. In recognition of the critical important of corals, coral colony size and condition surveys are a key component of the Guam Long-term Coral Reef Monitoring Program. Coral colony size and condition surveys have been conducted at high priority reef sites around Guam since August 2010. The surveys are carried out at numerous sampling stations within each monitoring site, the locations of which were generated randomly using a Geographic Information System and the relevant bathymetric and benthic habitat data. A split-panel approach is currently used for the sampling design, with half of all sampling stations in a given site being fixed and half re-randomized every visit or every other visit. The monitoring team assesses the size and condition of all coral colonies found within quadrats placed every 5 meters along 25-m transects (15-m transects for the Western Shoals site). These monitoring data on coral communities provide results on coral colony density, size, condition, and diversity; allow for exploration of community structure by functional group and size; and can be used to detect changes in coral communities over time.

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CoRIS_Metadata Guam Coral Reef Monitoring Data Management Initiative 488 Marine Ecosystem Coral Reef Ecosystem Long-term Monitoring Program Coral Coral Colony Size and Condition Survey Coral Quadrat Survey Permanent Quadrat Rapid Ecological Assessments REA Guam Long-term Coral Reef Monitoring Program Coral Colony Size Coral Species Richness Coral Colony Condition Coral Disease Coral Partial Mortality Numeric Data Sets > Biology EARTH SCIENCE > Oceans > Marine Biology > Coral EARTH SCIENCE > Oceans > Marine Biology > Coral Communities EARTH SCIENCE > Biosphere > Ecological Dynamics > Species Richness EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs EARTH SCIENCE > Oceans > Coastal Processes > Coral Reefs > Coral Reef Ecology EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Rapid assessment studies EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Coral Colony Size and Condition EARTH SCIENCE > Biosphere > Zoology > Corals > Reef Monitoring and Assessment > Coral Colony Size and Condition > Quadrat Monitoring Marianas Mariana Islands Mariana Archipelago OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Guam (13N144E0000) COUNTRY/TERRITORY > United States of America > Guam > Guam (13N144E0000) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > East Agana Bay (13N144E0063) COUNTRY/TERRITORY > United States of America > Guam > East Agana Bay (13N144E0063) COUNTRY/TERRITORY > United States of America > Guam > Piti Bay (13N144E0061) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Piti Bay (13N144E0061) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Tumon Bay (13N144E0004) COUNTRY/TERRITORY > United States of America > Guam > Tumon Bay (13N144E0004) COUNTRY/TERRITORY > United States of America > Guam > Western Shoal (13N144E0062) OCEAN BASIN > Pacific Ocean > Western Pacific Ocean > Guam > Western Shoal (13N144E0062)

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